atmel sam4s xplained pro - microchip technology...atmel-42075c-sam4s-xplained-pro_user guide-06/2015...

Atmel SMART Microcontrollers

SAM4S Xplained Pro

USER GUIDE

Preface

The Atmel® SAM4S Xplained Pro evaluation kit is a hardware platform toevaluate the SAM4SD32C microcontroller.

Supported by the Atmel Studio integrated development platform, the kitprovides easy access to the features of the Atmel SAM4SD32C and explainshow to integrate the device in a custom design.

The Xplained Pro MCU series evaluation kits include an on-boardEmbedded Debugger, and no external tools are necessary to program ordebug the SAM4SD32C.

The Xplained Pro extension series evaluation kits offers additionalperipherals to extend the features of the board and ease the development ofcustom designs.

Atmel-42075C-SAM4S-Xplained-Pro_User Guide-06/2015

Table of Contents

Preface............................................................................................................................ 1

1. Introduction................................................................................................................31.1. Features....................................................................................................................................... 31.2. Kit Overview................................................................................................................................. 3

2. Getting Started...........................................................................................................52.1. Xplained Pro Quick Start.............................................................................................................. 52.2. Design Documentation and Relevant Links................................................................................. 5

3. Xplained Pro.............................................................................................................. 63.1. Embedded Debugger................................................................................................................... 63.2. Hardware Identification System....................................................................................................63.3. Power Sources............................................................................................................................. 73.4. Xplained Pro Standard Headers and Connectors........................................................................ 8

3.4.1. Xplained Pro Standard Extension Header..................................................................... 83.4.2. Xplained Pro LCD Extension Connector........................................................................93.4.3. Xplained Pro Power Header.........................................................................................11

4. Hardware Users Guide............................................................................................ 124.1. Connectors................................................................................................................................. 12

4.1.1. Xplained Pro Extension Headers.................................................................................124.1.2. LCD Extension Connector........................................................................................... 144.1.3. Current Measurement Header..................................................................................... 164.1.4. Other Headers............................................................................................................. 16

4.2. Peripherals................................................................................................................................. 174.2.1. NAND Flash.................................................................................................................174.2.2. SD Card Connector..................................................................................................... 184.2.3. Crystals........................................................................................................................184.2.4. Mechanical Buttons..................................................................................................... 194.2.5. LED..............................................................................................................................194.2.6. Analog Reference........................................................................................................ 19

4.3. Embedded Debugger Implementation........................................................................................194.3.1. Serial Wire Debug........................................................................................................194.3.2. Virtual COM Port..........................................................................................................204.3.3. Atmel Data Gateway Interface.....................................................................................20

5. Hardware Revision History and Known Issues........................................................215.1. Identifying Product ID and Revision........................................................................................... 215.2. Revision 5...................................................................................................................................215.3. Revision 4...................................................................................................................................21

6. Document Revision History..................................................................................... 23

7. Evaluation Board/kit Important Notice..................................................................... 24

Atmel SAM4S Xplained Pro [USER GUIDE]Atmel-42075C-SAM4S-Xplained-Pro_User Guide-06/2015

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1. Introduction

1.1. Features• Atmel ATSAM4SD32C microcontroller• Embedded debugger (EDBG)

– USB interface– Programming and debugging (target) through Serial Wire Debug (SWD)– Virtual COM-port interface to target via UART– Atmel Data Gateway Interface (DGI) to target via synchronous SPI or TWI– Four GPIOs connected to target for code instrumentation

• Digital I/O

– Two mechanical buttons (user and reset button)– One user LED– Three extension headers

• LCD display header• USB interface for host and device function (target)• 2Gb NAND Flash for non-volatile storage• SD card connector• Adjustable analog reference• Three possible power sources

– External power– Embedded debugger USB– Target USB

• 12MHz crystal• 32kHz crystal

1.2. Kit OverviewThe Atmel SAM4S Xplained Pro evaluation kit is a hardware platform to evaluate the AtmelATSAM4SD32C.

The kit offers a set of features that enables the ATSAM4SD32C user to get started using theATSAM4SD32C peripherals right away and to get an understanding of how to integrate the device in theirown design.


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Figure 1-1 SAM4S Xplained Pro Evaluation Kit Overview


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2. Getting Started

2.1. Xplained Pro Quick StartThree steps to start exploring the Atmel Xplained Pro platform:

1. Download Atmel Studio.2. Launch Atmel Studio.3. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the DEBUG USB

port on the kit.4. Connect SAM4S Xplained Pro to a Xplained Pro MCU board and connect a USB cable to DEBUG

USB port on the Xplained Pro MCU board.

When the Atmel SAM4S Xplained Pro is connected to your computer for the first time, the operatingsystem will do a driver software installation. The driver file supports both 32-bit and 64-bit versions ofMicrosoft® Windows® XP, Windows Vista®, Windows 7, and Windows 8.

Once the Xplained Pro MCU board is powered the green power LED will be lit and Atmel Studio will autodetect which Xplained Pro MCU- and extension board(s) are connected. Atmel Studio will presentrelevant information like datasheets and kit documentation. The kit landing page in Atmel Studio also hasthe option to launch Atmel Software Framework (ASF) example applications for the kit. The SAM4Sdevice is programmed and debugged by the on-board Embedded Debugger and therefore no externalprogrammer or debugger tool is needed.

2.2. Design Documentation and Relevant LinksThe following list contains links to the most relevant documents and software for SAM4S Xplained Pro:

• Xplained Pro products - Atmel Xplained Pro is a series of small-sized and easy-to-use evaluationkits for Atmel microcontrollers and other Atmel products. It consists of a series of low cost MCUboards for evaluation and demonstration of features and capabilities of different MCU families.

• Atmel Studio - Free Atmel IDE for development of C/C++ and assembler code for Atmelmicrocontrollers.

• Atmel sample store - Atmel sample store where you can order samples of devices.• EDBG User Guide - User guide containing more information about the on-board Embedded

Debugger.• IAR Embedded Workbench® for ARM - This is a commercial C/C++ compiler that is available for

ARM. There is a 30 day evaluation version as well as a code size limited kick-start version availablefrom their website. The code size limit is 16KB for devices with M0, M0+, and M1 cores and 32KBfor devices with other cores.

• Atmel Data Visualizer - Atmel Data Visualizer is a program used for processing and visualizingdata. Data Visualizer can receive data from various sources such as the Embedded Debugger DataGateway Interface found on Xplained Pro boards, and COM ports.

• Design Documentation - Package containing CAD source, schematics, BOM, assembly drawings,3D plots, layer plots etc.

• Hardware Users Guide in PDF format - PDF version of this User Guide.• SAM4S Xplained Pro in the Atmel store - Atmel Store link.


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http://www.atmel.com/studiohttp://www.atmel.com/XplainedProhttp://www.atmel.com/studiohttp://www.atmel.com/system/samplesstorehttp://www.atmel.com/Images/Atmel-42096-Microcontrollers-Embedded-Debugger_User-Guide.pdfhttp://www.iar.com/en/Products/IAR-Embedded-Workbench/ARM/https://gallery.atmel.com/Products/Details/55d2b276-130a-452c-8dd7-899be78ec670http://www.atmel.com/Images/Atmel-42075-SAM4S-Xplained-Pro_User-Guide.ziphttp://www.atmel.com/Images/Atmel-42075-SAM4S-Xplained-Pro_User-Guide.pdfhttp://www.atmel.com/tools/ATSAM4S-XPRO.aspx

3. Xplained ProXplained Pro is an evaluation platform that provides the full Atmel microcontroller experience. Theplatform consists of a series of Microcontroller (MCU) boards and extension boards that are integratedwith Atmel Studio, have Atmel Software Framework (ASF) drivers and demo code, support datastreaming, and more. Xplained Pro MCU boards support a wide range of Xplained Pro extension boardsthat are connected through a set of standardized headers and connectors. Each extension board has anidentification (ID) chip to uniquely identify which boards are connected to an Xplained Pro MCU board.This information is used to present relevant user guides, application notes, datasheets, and examplecode through Atmel Studio.

3.1. Embedded DebuggerThe SAM4S Xplained Pro contains the Atmel Embedded Debugger (EDBG) for on-board debugging. TheEDBG is a composite USB device of three interfaces; a debugger, Virtual COM Port, and a Data GatewayInterface (DGI).

Together with Atmel Studio, the EDBG debugger interface can program and debug the SAM4SD32C. OnSAM4S Xplained Pro, the SWD interface is connected between the EDBG and the SAM4SD32C.

The Virtual COM Port is connected to a UART on the SAM4SD32C and provides an easy way tocommunicate with the target application through terminal software. It offers variable baud rate, parity, andstop bit settings. Note that the settings on the SAM4SD32C must match the settings given in the terminalsoftware.

The DGI consists of several physical interfaces for communication with the host computer.Communication over the interfaces are bidirectional. It can be used to send events and values from theSAM4SD32C or as a generic printf-style data channel. Traffic over the interfaces can be timestamped onthe EDBG for more accurate tracing of events. Note that timestamping imposes an overhead that reducesmaximal throughput. Atmel Data Visualizer is used to send and receive data through DGI.

The EDBG controls two LEDs on SAM4S Xplained Pro; a power LED and a status LED. Table 3-1 EDBGLED Control on page 6 shows how the LEDs are controlled in different operation modes.

Table 3-1 EDBG LED Control

Operation Mode Power LED Status LED

Normal operation Power LED is lit when power isapplied to the board.

Activity indicator, LED flasheswhen any communicationhappens to the EDBG.

Bootloader mode (idle) The power LED and the status LED blinks simultaneously.

Bootloader mode (firmwareupgrade)

The power LED and the status LED blinks in an alternating pattern.

For further documentation on the EDBG, see the EDBG User Guide.

3.2. Hardware Identification SystemAll Xplained Pro compatible extension boards have an Atmel ATSHA204 CryptoAuthentication™ chipmounted. This chip contains information that identifies the extension with its name and some extra data.When an Xplained Pro extension is connected to an Xplained Pro MCU board the information is read and


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https://gallery.atmel.com/Products/Details/55d2b276-130a-452c-8dd7-899be78ec670http://www.atmel.com/Images/Atmel-42096-Microcontrollers-Embedded-Debugger_User-Guide.pdf

sent to Atmel Studio. The Atmel Kits extension, installed with Atmel Studio, will give relevant information,code examples, and links to relevant documents. Table 3-2 Xplained Pro ID Chip Content on page 7shows the data fields stored in the ID chip with example content.

Table 3-2 Xplained Pro ID Chip Content

Data field Data type Example content

Manufacturer ASCII string Atmel'\0'

Product Name ASCII string Segment LCD1 Xplained Pro'\0'

Product Revision ASCII string 02'\0'

Product Serial Number ASCII string 1774020200000010’\0’

Minimum Voltage [mV] uint16_t 3000

Maximum Voltage [mV] uint16_t 3600

Maximum Current [mA] uint16_t 30

3.3. Power SourcesThe SAM4S Xplained Pro kit can be powered by several power sources listed in Table 3-3 PowerSources for SAM4S Xplained Pro on page 7.

Table 3-3 Power Sources for SAM4S Xplained Pro

Power input Voltage requirements Current requirements Connector marking

External power 5V ± 2% (± 100mV) forUSB host operation.4.3V to 5.5V if USB hostoperation is notrequired.

Recommendedminimum is 1A to beable to provide enoughcurrent for connectedUSB devices and theboard itself.Recommendedmaximum is 2A due tothe input protectionmaximum currentspecification.

PWR

Embedded debuggerUSB

4.4V to 5.25V (accordingto USB spec)

500mA (according toUSB spec)

DEBUG USB

Target USB 4.4V to 5.25V (accordingto USB spec)

500mA (according toUSB spec)

TARGET USB

The kit will automatically detect which power sources are available and choose which one to useaccording to the following priority:

1. External power.2. Embedded Debugger USB.3. Target USB.


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Info: External power is required when 500mA from a USB connector is not enough to power aconnected USB device in a USB host application.

3.4. Xplained Pro Standard Headers and Connectors

3.4.1. Xplained Pro Standard Extension HeaderAll Xplained Pro kits have one or more dual row, 20-pin, 100mil extension header. Xplained Pro MCUboards have male headers, while Xplained Pro extensions have their female counterparts. Note that allpins are not always connected. All connected pins follow the defined pin-out description in Table 3-4 Xplained Pro Standard Extension Header on page 8.

The extension headers can be used to connect a variety of Xplained Pro extensions to Xplained Pro MCUboards or to access the pins of the target MCU on Xplained Pro MCU boards directly.

Table 3-4 Xplained Pro Standard Extension Header

Pin number Name Description

1 ID Communication line to the ID chip on an extension board.

2 GND Ground.

3 ADC(+) Analog to digital converter, alternatively positive part of differentialADC.

4 ADC(-) Analog to digital converter, alternatively negative part of differentialADC.

5 GPIO1 General purpose I/O.

6 GPIO2 General purpose I/O.

7 PWM(+) Pulse width modulation, alternatively positive part of differentialPWM.

8 PWM(-) Pulse width modulation, alternatively negative part of differentialPWM.

9 IRQ/GPIO Interrupt request line and/or general purpose I/O.

10 SPI_SS_B/GPIO

Slave select for SPI and/or general purpose I/O.

11 I2C_SDA Data line for I2C interface. Always implemented, bus type.

12 I2C_SCL Clock line for I2C interface. Always implemented, bus type.

13 UART_RX Receiver line of target device UART

14 UART_TX Transmitter line of target device UART

15 SPI_SS_A Slave select for SPI. Should preferably be unique.

16 SPI_MOSI Master out slave in line of serial peripheral interface. Alwaysimplemented, bus type.


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Pin number Name Description

17 SPI_MISO Master in slave out line of serial peripheral interface. Alwaysimplemented, bus type.

18 SPI_SCK Clock for serial peripheral interface. Always implemented, bus type.

19 GND Ground.

20 VCC Power for extension board.

3.4.2. Xplained Pro LCD Extension ConnectorThe LCD connector provides the ability to connect to display extensions that have a parallel interface.The connector implements signals for a MCU parallel bus interface and a LCD controller interface as wellas signals for a touch controller. The connector pin-out definition is shown in Table 3-5 Xplained Pro LCDConnector on page 9. Note that usually only one display interface is implemented, either LCDcontroller or the MCU bus interface.

A FPC/FFC connector with 50 pins and 0.5mm pitch is used for the LCD connector. The connectorXF2M-5015-1A from Omron is used on several Xplained Pro designs and can be used as a reference.

Table 3-5 Xplained Pro LCD Connector

Pin number Name RGB interface description MCU interface description

1 ID Communication line to the ID chip on an extension board

2 GND Ground

3 D0 Data line

4 D1 Data line

5 D2 Data line

6 D3 Data line

7 GND Ground

8 D4 Data line

9 D5 Data line

10 D6 Data line

11 D7 Data line

12 GND Ground

13 D8 Data line

14 D9 Data line

15 D10 Data line

16 D11 Data line

17 GND Ground

18 D12 Data line

19 D13 Data line


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20 D14 Data line

21 D15 Data line

22 GND Ground

23 D16 Data line

24 D17 Data line

25 D18 Data line

26 D19 Data line

27 GND Ground

28 D20 Data line

29 D21 Data line

30 D22 Data line

31 D23 Data line

32 GND Ground

33 PCLK / CMD DATASEL

Pixel clock Display RAM select. Oneaddress line of the MCU fordisplays where it is possible toselect either register or datainterface.

34 VSYNC / CS Vertical Synchronization Chip select

35 HSYNC / WE Horizontal Synchronization Write enable signal

36 DATA ENABLE /RE

Data enable signal Read enable signal

37 SPI SCK Clock for serial peripheral interface

38 SPI MOSI Master out slave in of serial peripheral interface

39 SPI MISO Master in slave out of serial peripheral interface

40 SPI SS Slave select for serial peripheral interface. Preferably a dedicatedpin.

41 ENABLE Display enable

42 I2C SDA I2C data

43 I2C SCL I2C clock

44 IRQ1 Interrupt 1

45 IRQ2 Interrupt 2

46 PWM Backlight control

47 RESET Extension reset

48 VCC 3.3V power supply for extension board


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49 VCC 3.3V power supply for extension board

50 GND Ground

3.4.3. Xplained Pro Power HeaderThe power header can be used to connect external power to the SAM4S Xplained Pro kit. The kit willautomatically detect and switch to any external power if supplied. The power header can also be used assupply for external peripherals or extension boards. Care must be taken not to exceed the total currentlimitation of the on-board regulator when using the 3.3V pin.

Table 3-6 Xplained Pro Power Header

Pin number Pin name Description

1 VEXT_P5V0 External 5V input

2 GND Ground

3 VCC_P5V0 Unregulated 5V (output, derived from one of hte input sources)

4 VCC_P3V3 Regulated 3.3V (output, used as main power supply for the kit)


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4. Hardware Users Guide

4.1. ConnectorsThis chapter describes the implementation of the relevant connectors and headers on SAM4S XplainedPro and their connection to the SAM4SD32C. The tables of connections in this chapter also describeswhich signals are shared between the headers and on-board functionality.

4.1.1. Xplained Pro Extension HeadersThe SAM4S Xplained Pro headers EXT1, EXT2, and EXT3 offers access to the I/O of the microcontrollerin order to expand the board e.g. by connecting extensions to the board. These headers all comply withthe standard extension header specified in Xplained Pro Standard Extension Header on page 8. Allheaders have a pitch of 2.54mm.

Table 4-1 Extension Header EXT1

Pin on EXT1 SAM4S pin Function Shared functionality

1 - - Communication line to ID chip onextension board.

2 - - GND

3 PA17 AD[0]

4 PA18 AD[1]

5 PA24 GPIO PIOD Interface Header

6 PA25 GPIO PIOD Interface Header

7 PA23 PWMH0 PIOD Interface Header

8 PA19 PWML0

9 PA1 WKUP1/GPIO

10 PA6 GPIO DGI_GPIO0 on EDBG

11 PA3 TWD0 EXT2 and EDBG

12 PA4 TWCK0 EXT2 and EDBG

13 PA21 USART1/RXD1 EXT2

14 PA22 USART1/TXD1 EXT2

15 PA11 SPI/NPCS[0]

16 PA13 SPI/MOSI EXT2, EXT3, LCD connector (EXT4)and EDBG

17 PA12 SPI/MISO EXT2, EXT3, LCD connector (EXT4)and EDBG

18 PA14 SPI/SPCK EXT2, EXT3, LCD connector (EXT4)and EDBG


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19 - - GND

20 - - VCC




2 - - GND

3 PB0 AD[4]

4 PB1 AD[5]

5 PC24 GPIO DGI_GPIO2 on EDBG


7 PC19 PWMH1

8 PA20 PWML1

9 PC26 GPIO

10 PC27 GPIO

11 PA3 TWD0 EXT1 and EDBG

12 PA4 TWCK0 EXT1 and EDBG

13 PA21 USART1/RXD1 EXT1

14 PA22 USART1/TXD1 EXT1

15 PA9 SPI/NPCS[1] LCD connector (EXT4)




19 - - GND

20 - - VCC




2 - - GND


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3 PC29 AD[13]

4 PC30 AD[14]

5 PC21 GPIO


7 PC20 PWMH2

8 PA16 PWML2 PIOD Header

9 PA0 WKUP0/GPIO LCD connector (EXT4)

10 PC31 GPIO

11 PB4 TWD1 LCD connector (EXT4)

12 PB5 TWCK1 LCD connector (EXT4)

13 PB2 USART1/RXD1 CDC UART

14 PB3 USART1/TXD1 CDC UART

15 PA10 SPI/NPCS[2] LCD connector (EXT4)




19 - - GND

20 - - VCC

4.1.2. LCD Extension ConnectorExtension connector EXT4 is a special connector for LCD displays. The physical connector is an OmronElectronics XF2M-5015-1A FPC connector.

Table 4-4 LCD Connector EXT4



2 - - GND

3 PC0 D0 NAND Flash

4 PC1 D1 NAND Flash

5 PC2 D2 NAND Flash

6 PC3 D3 NAND Flash

7 - - GND


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8 PC4 D4 NAND Flash

9 PC5 D5 NAND Flash

10 PC6 D6 NAND Flash

11 PC7 D7 NAND Flash

12 - - GND

13 - -

14 - -

15 - -

16 - -

17 - - GND

18 - -

19 - -

20 - -

21 - -

22 - - GND

23 - -

24 - -

25 - -

26 - -

27 - - GND

28 - -

29 - -

30 - -

31 - -

32 - - GND

33 PC18 A0

34 PC15 NPCS[1]

35 PC8 NWE

36 PC11 NRD

37

38

39

40


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41 PB14 GPIO

42 PB4 TWD1/SDA EXT3

43 PB5 TWCK1/SCL EXT3

44 PA0 WKUP0 EXT3

45 - -

46 PA15 PWML3 PIOD Interface header

47 PC28 GPIO

48 - VCC_P3V3

49 - VCC_P3V3 EXT2

50 - GND

4.1.3. Current Measurement HeaderAn angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge ofthe SAM4S Xplained Pro. All power to the SAM4SD32C is routed through this header. To measure thepower consumption of the device remove the jumper and replace it with an ammeter.

Caution: Removing the jumper from the pin-header while the kit is powered may cause theSAM4SD32C to be powered through its I/O pins. This may cause permanent damage to thedevice.

4.1.4. Other HeadersIn addition to the Xplained Pro extension headers, SAM4S Xplained Pro has two additional headers withspare signals that offers access to the I/O of the microcontroller which are otherwise not easily availableelsewhere or might be favorable to have collected together. All headers have a pitch of 2.54mm.

Table 4-5 SPARE SIGNALS Header

Pin on header SAM4S pin Function Shared functionality

1 PA2 DATRG User button, SW0

2 PA9 PWMF10 EXT2

3 PA26 TI0A2 SD Card and PIOD Interface header

4 PA27 TI0B2 SD Card and PIOD Interface header

5 PA28 TCLK1 SD Card and PIOD Interface header

6 PA29 TCLK2 SD Card and PIOD Interface header

7 PA31 PCK2 SD Card and PIOD Interface header

8 PB0 RTCOUT0 EXT2

9 PB1 RTCOUT1 EXT2

10 PB13 DAC0


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11 PB14 DAC1

12 - - GND

Table 4-6 PIOD INTERFACE Header


1 PA15 PIODCEN1 LCD connector

2 PA16 PIODCEN2 EXT3

3 PA23 PIODCCLK EXT1

4 PA24 PIODC0 EXT1

5 PA25 PIODC1 EXT1

6 PA26 PIODC2 SD Card and SPARE Signals header




10 PA30 PIODC6 SD Card


12 - - GND

4.2. Peripherals

4.2.1. NAND FlashThe SAM4S Xplained Pro kit has one 2Gb NAND Flash connected to the external bus interface of theSAM4S.Table 4-7 NAND Flash Connections

SAM4S pin Function NAND flashfunction

Shared functionality

PC0 D0 IO0 LCD connector








PC9 NANDOE RE (active low)


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SAM4S pin Function NAND flashfunction

Shared functionality

PC10 NANDWE WE (active low)

PC13 GPIO R (active high)/ B(active low)

PC14 NCS[0] CE (active low)

PC16 NANDALE ALE (active low)

PC17 NANDCLE CLE

4.2.2. SD Card ConnectorThe SAM4S Xplained Pro kit has one SD card connector which is connected to High Speed MultimediaCard Interface (HSMCI) of the SAM4S.Table 4-8 SD Card Connections

SAM4S pin Function SD card function Shared functionality

PA26 MCDA2 DAT2 SPARE Signal and PIOD Interfaceheaders


PA28 MCCDA CMD SPARE Signal and PIOD Interfaceheaders

PA29 MCCK CLK SPARE Signal and PIOD Interfaceheaders

PA30 MCDA0 DAT0 PIOD Interface header


PC12 GPIO Card Detect

4.2.3. CrystalsThe SAM4S Xplained Pro kit contains two crystals that can be used as clock sources for the SAM4Sdevice. Each crystal has a cut-strap next to it that can be used to measure the oscillator safety factor.This is done by cutting the strap and adding a resistor across the strap. More information about oscillatorallowance and safety factor can be found in appnote AVR4100.

Table 4-9 External 32.768kHz Crystal

Pin on SAM4S Function

PA49 XIN32

PA48 XOUT32


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http://www.atmel.com/images/doc8333.pdf

Table 4-10 External 12MHz Crystal


PB9 XIN0

PB8 XOUT0

4.2.4. Mechanical ButtonsSAM4S Xplained Pro contains two mechanical buttons. One button is the RESET button connected to theSAM4S reset line and the other is a generic user configurable button. When a button is pressed it willdrive the I/O line to GND.

Table 4-11 Mechanical Buttons

Pin on SAM4S Silkscreen text

NRST RESET

PC24 SW0

4.2.5. LEDThere is one yellow LED available on the SAM4S Xplained Pro board that can be turned on and off. TheLED can be activated by driving the connected I/O line to GND.

Table 4-12 LED Connection

Pin on SAM4S LED

PC23 Yellow LED0

4.2.6. Analog ReferenceAn adjustable voltage reference is implemented on the kit to have a reference for the ADC or DAC. Thereference can be adjusted with the on-board multiturn trimmer potentiometer. Next to the potentiometer, a2-pin header is available to measure the reference voltage for the AREF pin of the SAM4S. The voltageoutput range for the reference is 0V - 3.36V.

4.3. Embedded Debugger ImplementationSAM4S Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and debugthe ATSAM4SD32C using Serial Wire Debug (SWD). The Embedded Debugger also include a VirtualCom port interface over UART, an Atmel Data Gateway Interface over SPI and TWI and it monitors four ofthe SAM4S GPIOs. Atmel Studio can be used as a front end for the Embedded Debugger.

4.3.1. Serial Wire DebugThe Serial Wire Debug (SWD) use two pins to communicate with the target. For further information onhow to use the programming and debugging capabilities of the EDBG, see EDBG User Guide.

Table 4-13 SWD Connections


PB7 SWD clock

PB6 SWD data


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http://www.atmel.com/Images/Atmel-42096-Microcontrollers-Embedded-Debugger_User-Guide.pdf


PB5 SWD trace output

PB12 Erase

4.3.2. Virtual COM PortThe Embedded Debugger act as a Virtual Com Port gateway by using one of the ATSAM4SD32C UARTs.For further information on how to use the Virtual COM port see Embedded Debugger on page 6.

Table 4-14 Virtual COM Port Connections


PB3 UART TXD (SAM4S TX line)

PB2 UART RXD (SAM4S RX line)

4.3.3. Atmel Data Gateway InterfaceThe Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either a SPI or TWIport. The DGI can be used to send a variety of data from the SAM4S to the host PC. For furtherinformation on how to use the DGI interface see Embedded Debugger on page 6.

Table 4-15 DGI Interface Connections when using SPI


PA5 Slave select (SAM4S is Master)

PA12 SPI MISO (Master In, Slave Out)

PA13 SPI MOSI (Master Out, Slave in)

PA14 SPI SCK (Clock Out)

Table 4-16 DGI Interface Connections when using TWI


PA3 SDA (Data line)

PA4 SCL (Clock line)

Four GPIO lines are connected to the Embedded Debugger. The EDBG can monitor these lines and timestamp pin value changes. This makes it possible to accurately time stamp events in the SAM4Sapplication code. For further information on how to configure and use the GPIO monitoring features see Embedded Debugger on page 6.

Table 4-17 GPIO Lines Connected to the EDBG


PA6 GPIO0

PC22 GPIO1

PC24 GPIO2

PC25 GPIO3


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5. Hardware Revision History and Known Issues

5.1. Identifying Product ID and RevisionThe revision and product indentifier of Xplained Pro boards can be found in two ways; through AtmelStudio or by looking at the sticker on the bottom side of the PCB.

By connecting a Xplained Pro MCU board to a computer with Atmel Studio running, an informationwindow will pop up. The first six digits of the serial number, which is listed under kit details, contain theproduct identifier and revision. Information about connected Xplained Pro extension boards will alsoappear in the Atmel Kits window.

The same information can be found on the sticker on the bottom side of the PCB. Most kits will print theidentifier and revision in plain text as A09-nnnn\rr where nnnn is the identifiser and rr is the revision.Boards with limited space have a sticker with only a QR-code which contains ta serial number string.

The serial number string has the following format:

"nnnnrrssssssssss"

n = product identifier

r = revision

s = serial number

The product indentifier for SAM4S Xplained Pro is A09-1803.

5.2. Revision 5On this revision, the SPI clock net is improved to reduce any issues that might be caused by reflections.The SPI has been removed from the LCD (EXT4 connector) to reduce load on the clock net. Theremaining clock lines have been divided into four terminated nets for each SPI source (EXT1, EXT2,EXT3, and EDBG) and routed in a star like layout. A series terminator resistor of 43ohm is placed oneach clock net, close to the SPI clock pin. This reduces any issues that might be caused by reflectionscoming back from unterminated/unused clock lines. It also reduces the rise/fall time of the clock edgesand that will also help to reduce any reflection issues.

Known issues

• There is no LC filter on the VDDPLL supply pin on the kit. This may cause excess ripple on thesupply voltage which can cause the 48MHz PLL to not lock, which means USB applications maynot work. For more information see the AT03463 SAM4S Schematic Checklist.

5.3. Revision 4Known issues

• SAM4S has an on-die series termination of the SPI CLK which makes this signal not usable for amulti drop clock distribution because all devices along the line will see a fraction of VCC until thesignal is reflected from the end of the transmission line. On the SAM4S Xplained Pro revision 4 thissignal is routed to each extension connector with EXT1 at the end of the line. That meansextensions that are connected along the transission line e.g. EXT3 header is likely to fail due to a


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http://www.atmel.com/Images/Atmel-42155-SAM-AT03463-SAM4S_schematic_checklist_Application-Notes.pdf

non-monotinic edge caused by relections and the fraction of VCC that is present for a short timeuntil the reflection comes back from the end of the line.

Workaround:

– By slowing down the clock rise time with a capacitor, and thus effectively increasing the linelength at which point it becomes a transmission line, it is possible to remove the clock issue.A 56pF capacitor has been mounted on the bottom side of the board between the SPI clockand GND. This however reduces the maximum SPI clock speed and it is recommended to notrun this faster than 30MHz (this also depends on how much additional capacitance is addedby connected extensions and needs to be checked case by case). The capacitor was addedon revision 4 on the bottom side of the EXT3 header.


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6. Document Revision HistoryDoc. rev. Date Comment

42075C 05/2015 Table 4-17 GPIO Lines Connected to the EDBG on page 20 now lists thecorrect GPIO names, changed PA6, PA22, PA24, and PA25 to PA6,PC22, PC24, and PC25. Added errata about missing LC filter on theVDDPLL pin.

42075B 03/2013 Added information about changes done on Revision 5 on page 21 of thekit.

42075A 02/2013 Initial document release.


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7. Evaluation Board/kit Important NoticeThis evaluation board/kit is intended for use for FURTHER ENGINEERING, DEVELOPMENT,DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is not a finished product and may not(yet) comply with some or any technical or legal requirements that are applicable to finished products,including, without limitation, directives regarding electromagnetic compatibility, recycling (WEEE), FCC,CE or UL (except as may be otherwise noted on the board/kit). Atmel supplied this board/kit "AS IS,"without any warranties, with all faults, at the buyer's and further users' sole risk. The user assumes allresponsibility and liability for proper and safe handling of the goods. Further, the user indemnifies Atmelfrom all claims arising from the handling or use of the goods. Due to the open construction of theproduct, it is the user's responsibility to take any and all appropriate precautions with regard toelectrostatic discharge and any other technical or legal concerns.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER USER NOR ATMELSHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, ORCONSEQUENTIAL DAMAGES.

No license is granted under any patent right or other intellectual property right of Atmel covering orrelating to any machine, process, or combination in which such Atmel products or services might be orare used.

Mailing Address: Atmel Corporation1600 Technology DriveSan Jose, CA 95110USA


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Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com

© 2015 Atmel Corporation. / Rev.: Atmel-42075C-SAM4S-Xplained-Pro_User Guide-06/2015

Atmel®, Atmel logo and combinations thereof, Enabling Unlimited Possibilities®, AVR®, QTouch®, and others are registered trademarks or trademarks of AtmelCorporation in U.S. and other countries. Microsoft®, Windows®, and Windows Vista® are registered trademarks of Microsoft Corporation in U.S. and or othercountries. ARM® is a registered trademark of ARM Ltd. Other terms and product names may be trademarks of others.

DISCLAIMER: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to anyintellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS ANDCONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIEDOR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESSINTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISEDOF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of thisdocument and reserves the right to make changes to specifications and products descriptions at any time without notice. Atmel does not make any commitment toupdate the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotiveapplications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.

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PrefaceTable of Contents1. Introduction1.1. Features1.2. Kit Overview

2. Getting Started2.1. Xplained Pro Quick Start2.2. Design Documentation and Relevant Links

3. Xplained Pro3.1. Embedded Debugger3.2. Hardware Identification System3.3. Power Sources3.4. Xplained Pro Standard Headers and Connectors3.4.1. Xplained Pro Standard Extension Header3.4.2. Xplained Pro LCD Extension Connector3.4.3. Xplained Pro Power Header

4. Hardware Users Guide4.1. Connectors4.1.1. Xplained Pro Extension Headers4.1.2. LCD Extension Connector4.1.3. Current Measurement Header4.1.4. Other Headers

4.2. Peripherals4.2.1. NAND Flash4.2.2. SD Card Connector4.2.3. Crystals4.2.4. Mechanical Buttons4.2.5. LED4.2.6. Analog Reference

4.3. Embedded Debugger Implementation4.3.1. Serial Wire Debug4.3.2. Virtual COM Port4.3.3. Atmel Data Gateway Interface

5. Hardware Revision History and Known Issues5.1. Identifying Product ID and Revision5.2. Revision 55.3. Revision 4

6. Document Revision History7. Evaluation Board/kit Important Notice

atmel sam4s xplained pro - microchip technology...atmel-42075c-sam4s-xplained-pro_user guide-06/2015...

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